Flasumo 

It’s the right given to high school students, that says that if the don’t want to dance a certain style of dancing, they don’t to do it.

Teacher: you have to do it
Student: but I have flasumo
Teacher: oh, okay then

Flasumo by Anna Millen January 12, 2019

Flashmob Rave 

A short rave, usually lasting around fifteen minutes. These are often held during finals weeks at universities as a sort of study break.

"I'm so stressed out about finals, I can't wait until the flashmob rave at midnight."

Flashmob Rave by XenonScreams December 14, 2009

Flashmob 

A flashmob is when a large group of people suddenly come together and perform some sort of action, which draws an audience very quickly. After they perform the stunt, the group of people quickly disperse.

Shay Carl, Kassem G, Lisanova, hiimrawn, mysteryguitarman, denisevlogs, and other people came together at the Planet Hollywood Resort and Casino to perform a huge flashmob. It is one of the best flashmobs on YouTube. The video is called "PHAMOUS PLANET HOLLYWOOD FLASH MOB!", uploaded on ShayCarl's channel.

Flashmob by jlt1 November 30, 2009

Flashmob 

A group of arts students with far too much spare time on their hands that collectively pre-arrange to "spontaneously" burst into song or theatrical performance in public spaces to annoy the general public.

I would go apeshit if a flashmob ever erupted in my presence.

Flashmob by cynicroute December 1, 2010

Flashmob Sale

Unsanctioned, crowd-sourced 100% off sales on high-fashion clothing, handbags and accessories at stores such as Nordstrum and Neiman Marcus. Commonly referenced in mainstream media as "Grab-and-run robberies" or "organized retail theft," Flashmob Sales generally involve the redistribution of symbols of capitalist wealth in the order of hundreds of thousands of dollars, taken from icons of retail excess and redistributed to those in need of a fashion upgrade for the holidays.

Rumored to be inspired by the Bob Dylan lyric, "Steal a little and they throw you in jail, steal a lot and the make you king," the proponents of Flashmob Sales are under the apparent belief that if enough people steal a ton of items all at once, the internet will cheer them on and the police will simply go back to finding unarmed civilians to shoot for sport.

"Nice sweater? Is that made from recycled laundry lint?" "Thanks! Yeah, I got it a Flashmob Sale down at the Grove!"

Flashmob Sale by Cultureninja November 25, 2021

Facebook Flashmob 

In a collective effort, facebook friends of one person steal and adopt his/her profile picture, and each tag the original owner in their new pic. Then the group then likes and comments on everyone's new profile pic, ensuring a barrage of notifications for the target person. Works much better if the adopted picture is in any way scandalous.

Last night while Matt was out to dinner with his parents, 10 of us got him with a facebook flashmob. His phone must have buzzed non stop with notifications!

Facebook Flashmob by Mister Snarls August 20, 2011

Flashmorb 

A phenomena seen when a morbhead starts morbing vigorously in public and fellow

like-minded morbheads join them.

Good morbin' Paul! Did you see that flashmorb at Times Square?
Good morbin' to you too Jake! It was a sight to behold.

Flashmorb by Spidey20041 June 3, 2022